I Understand of no other mushrooms that bruis blue exept boletes(straightforward to differentiate, they have pores, not gills). i've listened to a thing a few lactarius (or some type of milky) that exudes a bluish latex but that would be wholly diferent than bruising. Stem The stem is off white, https://ukmushroomspores.uk/product-tag/liberty-caps-november-uk/